FR2928153A1 - NEW ADDITIVE FOR THE TREATMENT OF RESULTS STEELS - Google Patents
NEW ADDITIVE FOR THE TREATMENT OF RESULTS STEELS Download PDFInfo
- Publication number
- FR2928153A1 FR2928153A1 FR0851372A FR0851372A FR2928153A1 FR 2928153 A1 FR2928153 A1 FR 2928153A1 FR 0851372 A FR0851372 A FR 0851372A FR 0851372 A FR0851372 A FR 0851372A FR 2928153 A1 FR2928153 A1 FR 2928153A1
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- FR
- France
- Prior art keywords
- additive
- cored wire
- steel
- treatment
- steels
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/0056—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00 using cored wires
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/04—Removing impurities by adding a treating agent
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Treatment Of Steel In Its Molten State (AREA)
Abstract
La présente invention concerne un fil fourré comprenant un additif à base de silicate de calcium CaO.SiO2, destiné à traiter les aciers spéciaux dits resulfurés. L'invention a également trait à un procédé de fabrication d'aciers resulfurés au moyen du fil fourré précité. Le procédé selon l'invention est particulièrement adapté au traitement des inclusions solides présentes dans les bains d'acier comportant de l'aluminium. Le procédé de l'invention permet d'éviter la désulfuration préalable au traitement des inclusions solides.The present invention relates to a cored wire comprising an additive based on calcium silicate CaO.SiO2, for treating the so-called special resulfurized steels. The invention also relates to a process for manufacturing resulfided steels using the aforementioned cored wire. The process according to the invention is particularly suitable for the treatment of solid inclusions present in steel baths comprising aluminum. The process of the invention makes it possible to avoid desulfurization prior to the treatment of solid inclusions.
Description
l'addition de Ca, afin d'atteindre une teneur en S suffisamment faible, compatible avec l'ajout d'une grande quantité de Ca. Ensuite, seulement, on peut procéder à la resulfuration pour atteindre le niveau de soufre stipulé par le cahier des charges. the addition of Ca, in order to reach a sufficiently low S content, compatible with the addition of a large amount of Ca. Then, only, we can proceed to the resulfuration to reach the sulfur level stipulated by the notebook charges.
La figure 1 annexée schématise le process sidérurgique classique, qui comprend les trois étapes présentées ci-dessus: - étape 1: désulfuration de l'acier (période qui peut demander plusieurs dizaine de minutes) ; -étape 2 : traitement inclusionnaire; - étape 3 : resulfuration de l'acier. La présente invention se propose de simplifier le process métallurgique de fabrication des aciers dits resulfurés (ou à haute teneur en soufre), assurant ainsi un gain de productivité, tout en garantissant un niveau de qualité équivalent et une bonne coulabilité des aciers obtenus. The appended FIG. 1 schematizes the conventional steelmaking process, which comprises the three steps presented above: step 1: desulphurization of the steel (period which can take several ten minutes); step 2: inclusionary treatment; step 3: resulfuration of the steel. The present invention proposes to simplify the metallurgical process for manufacturing so-called resulfurized steels (or high sulfur content), thus ensuring a productivity gain, while guaranteeing an equivalent level of quality and good flowability of the steels obtained.
A cet effet, l'invention concerne, selon un premier aspect, un fil fourré pour l'introduction d'additif dans un bain d'acier liquide, ledit fil fourré étant du type comprenant une gaine métallique entourant ledit additif, caractérisé en ce que ledit additif comprend majoritairement (au moins 85% en poids) du silicate de calcium Le fil fourré contenant le mélange d'oxydes à base de CaO.SiO2 permet avantageusement de shunter l'étape 1 précitée de désulfuration préalable (gain de plusieurs dizaines de minutes) et d'éviter l'ajout de Ca (sous toute forme : CaSi ou Ca pur), tout en garantissant un traitement efficace de la population inclusionnaire solide du bain d'acier liquide, compatible avec les techniques de coulée continue. For this purpose, the invention relates, according to a first aspect, to a flux-cored wire for the introduction of additive into a bath of liquid steel, said flux-cored wire being of the type comprising a metallic sheath surrounding said additive, characterized in that said additive comprises mainly (at least 85% by weight) of calcium silicate The cored wire containing the mixture of oxides based on CaO.SiO2 advantageously makes it possible to bypass the above-mentioned step 1 of prior desulfurization (gain of several tens of minutes ) and to avoid the addition of Ca (in any form: CaSi or pure Ca), while guaranteeing an effective treatment of the solid steel bath's inclusionary solid population, compatible with continuous casting techniques.
Ce fil fourré contenant le mélange d'oxydes à base de CaO.SiO2 permet en effet, lorsqu'il est introduit dans l'acier liquide, de modifier la nature et la morphologie des inclusions d'oxydes solides présentes dans le bain d'acier liquide sans risquer la formation de sulfures solides néfastes. Le fil fourré selon l'invention permet, lorsqu'il est introduit dans un bain d'acier liquide, de transformer les inclusions solides présentes dans l'acier liquide (essentiellement des oxydes tels que AI2O3) qui sont à l'origine des bouchages des coulées continues, en inclusions liquides qui s'écoulent facilement. This cored wire containing the mixture of oxides based on CaO.SiO2 makes it possible, when introduced into the liquid steel, to modify the nature and the morphology of the inclusions of solid oxides present in the steel bath. liquid without risking the formation of harmful solid sulphides. The flux-cored wire according to the invention makes it possible, when it is introduced into a bath of liquid steel, to transform the solid inclusions present in the liquid steel (essentially oxides such as Al 2 O 3) which are the cause of the blockages of the continuous flows, in liquid inclusions which flow easily.
Selon un deuxième aspect, l'invention se rapporte à un procédé de fabrication d'aciers spéciaux dits "resulfurés", ledit procédé comprenant une étape d'introduction, dans le bain d'acier liquide, du fil fourré de l'invention. Ces aciers présentent une teneur en soufre qui varie de 0, 02% à plus de 0,25% en poids. According to a second aspect, the invention relates to a method for manufacturing special steels called "resulfurized", said method comprising a step of introducing, into the bath of liquid steel, the cored wire of the invention. These steels have a sulfur content which ranges from 0.02% to more than 0.25% by weight.
Dans une variante préférée de réalisation, le procédé de l'invention vise la fabrication d'aciers resulfurés calmés à l'aluminium. De manière caractéristique, le procédé selon l'invention permet de traiter les inclusions solides notamment d'oxyde d'aluminium AI2O3, contenues dans les bains d'aciers liquides destinés à la production d'aciers à haute teneur en soufre, sans qu'il soit nécessaire de procéder à la désulfuration préalable de l'acier, tout en garantissant une modification des inclusions solides et l'amélioration de le coulabilité exigée par les outils de coulées continues modernes. L'invention a également trait à l'utilisation du fil fourré précité pour améliorer la coulabilité des bains d'acier resulfurés. In a preferred embodiment, the method of the invention is directed to the manufacture of aluminum resulfided steels. Characteristically, the process according to the invention makes it possible to treat the solid inclusions, in particular of aluminum oxide AI2O3, contained in baths of liquid steels intended for the production of steels with a high sulfur content, without it being necessary to it is necessary to proceed with the prior desulphurization of the steel, while guaranteeing a modification of the solid inclusions and the improvement of the flowability required by the modern continuous casting tools. The invention also relates to the use of the aforementioned flux-cored wire to improve the flowability of the resulfurized steel baths.
L'invention va maintenant être décrite en détail. La présente invention a pour but de remplacer le traitement sidérurgique connu, destiné à contrôler la coulabilité d'un bain d'acier liquide notamment resulfuré, par un traitement à l'aide d'un additif à base de silicate de calcium. Comme moyen préféré d'introduction dudit additif dans le bain de métal liquide est utilisée la technique du fil fourré, reconnue pour son efficacité et sa simplicité. Le fil fourré pour l'introduction d'additif dans un bain d'acier liquide, selon l'invention, est du type comprenant une gaine métallique entourant ledit additif. Avantageusement, ledit additif comprend essentiellement du silicate de calcium apte à interagir avec les inclusions solides présentes dans l'acier liquide (notamment des oxydes d'aluminium AI2O3) et à les transformer en inclusions liquides qui s'écoulent facilement et permettent ainsi d'éviter des bouchages des coulées continues. L'additif destiné à être introduit dans le bain d'acier liquide, au moyen du fil fourré selon l'invention, peut en outre comprendre un fondant (tel que des fluorures), dont le rôle est d'abaisser la température de fusion de l'additif contenu dans le fil fourré, de sorte à l'amener à l'état liquide dès l'introduction dans le bain d'acier liquide et à le garder en cet état, car seule une composition liquide à base de silicate de calcium peut absorber les particules solides présentes dans le bain d'acier. La proportion du fondant dans l'additif est inférieure ou égale à 10% en poids. The invention will now be described in detail. The object of the present invention is to replace the known steel treatment, intended to control the flowability of a bath of liquid steel, in particular resulfurized steel, by treatment with the aid of a calcium silicate additive. As preferred means of introducing said additive into the liquid metal bath is used the cored wire technique, known for its efficiency and simplicity. The cored wire for the introduction of additive into a bath of liquid steel, according to the invention, is of the type comprising a metal sheath surrounding said additive. Advantageously, said additive essentially comprises calcium silicate capable of interacting with the solid inclusions present in the liquid steel (in particular aluminum oxides AI2O3) and transforming them into liquid inclusions which flow easily and thus make it possible to avoid blockages of continuous flows. The additive intended to be introduced into the bath of liquid steel, by means of the cored wire according to the invention, may further comprise a flux (such as fluorides), whose role is to lower the melting temperature of the additive contained in the flux-cored wire, so as to bring it to the liquid state as soon as it is introduced into the bath of liquid steel and to keep it in this state, since only a liquid composition based on calcium silicate can absorb the solid particles present in the steel bath. The proportion of flux in the additive is less than or equal to 10% by weight.
L'additif destiné à être introduit dans le bain d'acier liquide, au moyen du fil fourré selon l'invention, peut en outre comprendre un autre oxyde métallique tel que FeO ou MnO. La proportion des ces oxydes métalliques dans l'additif est inférieure ou égale à 2% en poids. Selon un deuxième aspect, l'invention se rapporte à un procédé de fabrication d'aciers spéciaux dits "resulfurés", ledit procédé comprenant une étape d'introduction, dans le bain d'acier liquide, du fil fourré de l'invention. Le procédé de l'invention comprend un traitement métallurgique destiné à modifier la nature et la morphologie des inclusions présentes dans un bain d'acier liquide (notamment des inclusions solides), à un moment précis de l'élaboration d'aciers resulfurés, à savoir préalablement à l'ajout de soufre. Ce traitement métallurgique consiste en l'introduction dans le bain d'acier liquide du fil fourré selon l'invention, comprenant un additif à base de silicate de calcium apte à agir sur les inclusions solides notamment d'alumine en les transformant en inclusions liquides, améliorant ainsi la coulabilité de l'acier traité. The additive intended to be introduced into the bath of liquid steel, by means of the cored wire according to the invention, may further comprise another metal oxide such as FeO or MnO. The proportion of these metal oxides in the additive is less than or equal to 2% by weight. According to a second aspect, the invention relates to a method for manufacturing special steels called "resulfurized", said method comprising a step of introducing, into the bath of liquid steel, the cored wire of the invention. The method of the invention comprises a metallurgical treatment intended to modify the nature and the morphology of the inclusions present in a bath of liquid steel (in particular solid inclusions), at a precise moment of the elaboration of resulfurized steels, namely prior to the addition of sulfur. This metallurgical treatment consists in introducing into the bath of liquid steel the flux-cored wire according to the invention, comprising a calcium silicate additive capable of acting on the solid inclusions, in particular of alumina, by transforming them into liquid inclusions. thus improving the flowability of the treated steel.
Le mécanisme exact d'interaction entre le silicate de calcium et le ou les composés entrant dans la constitution des inclusions solides présentes dans un bain d'acier liquide (notamment AI2O3) n'est pas connu. Vraisemblablement, il s'agit d'un processus physique d'absorption de l'alumine par le silicate de calcium, ce qui conduit à la formation de composés complexes AI2O3 ù CaO ù SiO2. The exact mechanism of interaction between the calcium silicate and the compound (s) involved in the constitution of the solid inclusions present in a bath of liquid steel (in particular Al 2 O 3) is not known. Presumably, it is a physical process of absorption of alumina by calcium silicate, which leads to the formation of complex compounds Al2O3-CaO-SiO2.
Le mélange d'oxydes contenu dans le fil fourré selon l'invention possède la particularité d'avoir un bas point de fusion. Le mélange strictement binaire CaO ù SiO2 présente un point eutectique à 1436°C (pour 63% de SiO2). Ce point de fusion peut être diminué si le mélange est associé à d'autres constituants tels que des oxydes métalliques (FeO, MnO) ou des fondants, par exemple du type CaF2. The oxide mixture contained in the cored wire according to the invention has the particularity of having a low melting point. The strictly binary CaO-SiO 2 mixture has a eutectic point at 1436 ° C (for 63% SiO 2). This melting point may be decreased if the mixture is combined with other constituents such as metal oxides (FeO, MnO) or fluxes, for example of the CaF2 type.
Les températures de travail de l'acier liquide au four poche sont bien supérieures à la température de fusion du mélange d'oxyde contenu dans le fil fourré. Il en découle que le fil fourré introduit dans le bain d'acier liquide libère de fines particules d'oxydes liquides. Ces inclusions liquides, réparties rapidement dans toute la poche d'acier liquide, ont un grand pouvoir de captation des inclusions solides d'alumine ou spinelles. De ce fait, la nature et la morphologie de ces inclusions endogènes vont être modifiées. La composition des inclusions recherchées est indiquée dans la figure 2 annexée, qui représente le diagramme ternaire AI2O3 û CaO û SiO2 (d'après [1]). Dans les figures 2 et 3 annexées, E représente l'eutectique CaO û SiO2, et VE représente la composition des inclusions recherchées. The working temperatures of the liquid steel in the pocket furnace are much higher than the melting temperature of the oxide mixture contained in the flux-cored wire. It follows that the flux-cored wire introduced into the liquid steel bath releases fine particles of liquid oxides. These liquid inclusions, distributed rapidly throughout the liquid steel ladle, have a great capacity for capturing solid inclusions of alumina or spinels. As a result, the nature and morphology of these endogenous inclusions will be modified. The composition of the desired inclusions is indicated in the appended FIG. 2, which represents the ternary diagram Al 2 O 3 - CaO 2 SiO 2 (from [1]). In the accompanying FIGS. 2 and 3, E represents the eutectic CaO-SiO2, and VE represents the composition of the desired inclusions.
Dans la suite du process, ces inclusions vont pouvoir décanter et être à leur tour captées par le laitier de poche. Les petites inclusions, non éliminées, n'auront aucune incidence ni sur la coulabilité, ni sur les propriétés finales de l'acier. Ce procédé présente plusieurs avantages. Il constitue notamment un traitement doux de l'acier à l'état liquide, à la différence du traitement connu à base de silico-calcium, caractérisé par une réaction très énergique du calcium avec l'oxygène et/ou le soufre présent(s) dans le bain d'acier. La synthèse de sulfure de calcium, formant des inclusions solides, est ainsi évitée. Le procédé selon l'invention est particulièrement adapté au traitement des inclusions solides présentes dans les bains d'acier comportant de l'aluminium. In the rest of the process, these inclusions will be able to decant and be in turn captured by the pocket slag. Small inclusions, not eliminated, will have no impact on the flowability or the final properties of the steel. This process has several advantages. It is particularly a mild treatment of steel in the liquid state, unlike the known treatment based on silico-calcium, characterized by a very energetic reaction of calcium with oxygen and / or sulfur present (s) in the steel bath. The synthesis of calcium sulphide, forming solid inclusions, is thus avoided. The process according to the invention is particularly suitable for the treatment of solid inclusions present in steel baths comprising aluminum.
Surtout, le procédé de l'invention permet d'éviter la désulfuration préalable au traitement des inclusions solides, avant de procéder à l'étape de resulfuration de l'acier à l'état liquide. Above all, the process of the invention makes it possible to avoid desulphurization prior to the treatment of solid inclusions, before proceeding to the step of resulphurizing the steel in the liquid state.
Référence bibliographique Bibliographic reference
[1] - Slag Atlas, 2'd edition, edited by Verein Deutscher Eisenhüttenleute (VDEh), ISBN 3-514-00457-9 [1] - Slag Atlas, 2nd edition, edited by Verein Deutscher Eisenhüttenleute (VDEh), ISBN 3-514-00457-9
Claims (10)
Priority Applications (6)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR0851372A FR2928153B1 (en) | 2008-03-03 | 2008-03-03 | NEW ADDITIVE FOR THE TREATMENT OF RESULTS STEELS |
BRPI0908043-0A BRPI0908043A2 (en) | 2008-03-03 | 2009-03-03 | Filler wire for the introduction of additive into a liquid steel bath, resulfurized steel fabrication process and use of filler wire |
ES09721360.7T ES2654921T3 (en) | 2008-03-03 | 2009-03-03 | New additive for the treatment of steels |
EP09721360.7A EP2252712B1 (en) | 2008-03-03 | 2009-03-03 | Novel additive for treating resulphurized steel |
PCT/FR2009/050341 WO2009115722A1 (en) | 2008-03-03 | 2009-03-03 | Novel additive for treating resulphurized steel |
US12/920,521 US9023126B2 (en) | 2008-03-03 | 2009-03-03 | Additive for treating resulphurized steel |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR0851372A FR2928153B1 (en) | 2008-03-03 | 2008-03-03 | NEW ADDITIVE FOR THE TREATMENT OF RESULTS STEELS |
Publications (2)
Publication Number | Publication Date |
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FR2928153A1 true FR2928153A1 (en) | 2009-09-04 |
FR2928153B1 FR2928153B1 (en) | 2011-10-07 |
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Application Number | Title | Priority Date | Filing Date |
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FR0851372A Expired - Fee Related FR2928153B1 (en) | 2008-03-03 | 2008-03-03 | NEW ADDITIVE FOR THE TREATMENT OF RESULTS STEELS |
Country Status (6)
Country | Link |
---|---|
US (1) | US9023126B2 (en) |
EP (1) | EP2252712B1 (en) |
BR (1) | BRPI0908043A2 (en) |
ES (1) | ES2654921T3 (en) |
FR (1) | FR2928153B1 (en) |
WO (1) | WO2009115722A1 (en) |
Families Citing this family (4)
Publication number | Priority date | Publication date | Assignee | Title |
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US8828117B2 (en) | 2010-07-29 | 2014-09-09 | Gregory L. Dressel | Composition and process for improved efficiency in steel making |
JP6848369B2 (en) | 2015-11-27 | 2021-03-24 | 日本製鉄株式会社 | Sulfur-added raw material to molten steel and manufacturing method of sulfur-added steel |
EP3540082A4 (en) * | 2016-11-10 | 2020-06-03 | Nippon Steel Corporation | Sulfur additive for molten steel, and method for manufacturing sulfur-added steel |
CN110819765A (en) * | 2019-11-18 | 2020-02-21 | 上海大学 | Core-spun yarn for reducing superheat degree of molten steel and using method thereof |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2792234A1 (en) * | 1999-04-15 | 2000-10-20 | Lorraine Laminage | Low or ultra-low carbon steel ladle treatment,, after or during aluminum killing and prior to continuous casting, comprises calcium addition in the presence of a small quantity of magnesium |
WO2005078142A1 (en) * | 2004-02-11 | 2005-08-25 | Tata Steel Limited | A cored wire injection process ih steel melts |
WO2006000714A2 (en) * | 2004-06-10 | 2006-01-05 | Affival | Cored wire |
EP1715065A2 (en) * | 2005-04-20 | 2006-10-25 | Corus Staal BV | A wire for injecting into a steel melt and process of treating a steel melt using said wire |
Family Cites Families (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS6037250A (en) * | 1983-08-10 | 1985-02-26 | Kawasaki Steel Corp | Mold additive for continuous casting of steel |
US5268141A (en) * | 1985-04-26 | 1993-12-07 | Mitsui Engineering And Ship Building Co., Ltd. | Iron based alloy having low contents of aluminum silicon, magnesium, calcium, oxygen, sulphur, and nitrogen |
BR9907636A (en) * | 1998-12-08 | 2000-11-14 | Shinagawa Refractories Co | Casting powder for continuous steel casting and continuous steel casting process |
-
2008
- 2008-03-03 FR FR0851372A patent/FR2928153B1/en not_active Expired - Fee Related
-
2009
- 2009-03-03 EP EP09721360.7A patent/EP2252712B1/en active Active
- 2009-03-03 ES ES09721360.7T patent/ES2654921T3/en active Active
- 2009-03-03 BR BRPI0908043-0A patent/BRPI0908043A2/en not_active IP Right Cessation
- 2009-03-03 WO PCT/FR2009/050341 patent/WO2009115722A1/en active Application Filing
- 2009-03-03 US US12/920,521 patent/US9023126B2/en active Active
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2792234A1 (en) * | 1999-04-15 | 2000-10-20 | Lorraine Laminage | Low or ultra-low carbon steel ladle treatment,, after or during aluminum killing and prior to continuous casting, comprises calcium addition in the presence of a small quantity of magnesium |
WO2005078142A1 (en) * | 2004-02-11 | 2005-08-25 | Tata Steel Limited | A cored wire injection process ih steel melts |
WO2006000714A2 (en) * | 2004-06-10 | 2006-01-05 | Affival | Cored wire |
EP1715065A2 (en) * | 2005-04-20 | 2006-10-25 | Corus Staal BV | A wire for injecting into a steel melt and process of treating a steel melt using said wire |
Non-Patent Citations (3)
Title |
---|
BERGMANN B ET AL: "CASTABILITY ASSURANCE OF AL-KILLED SI-FREE STEEL BY CALCIUM WIRE TREATMENT", 1ST EUROPEAN CONFERENCE ON CONTINUOUS CASTING, MILANO, IT, 23 September 1991 (1991-09-23), pages 1501 - 1508, XP000353907 * |
MURRAY P: "USE OF CORED WIRE TO INTRODUCE METALLIC POWDERS INTO MOLTEN METAL", METALLURGIST, CONSULTANTS BUREAU. NEW YORK, US, vol. 41, no. 1/02, 1 January 1997 (1997-01-01), pages 53 - 55, XP000722334, ISSN: 0026-0894 * |
OELSCHLAGEL ET AL: "Treating steel with Ferrokal wire", IRON AND STEEL, IPC SCIENCE AND TECHNOLOGY PRESS LTD. GUILDFORD, GB, vol. 54, no. 6, 1 December 1981 (1981-12-01), pages 323 - 330, XP001251404 * |
Also Published As
Publication number | Publication date |
---|---|
EP2252712A1 (en) | 2010-11-24 |
EP2252712B1 (en) | 2017-11-29 |
FR2928153B1 (en) | 2011-10-07 |
BRPI0908043A2 (en) | 2015-08-11 |
US20110017018A1 (en) | 2011-01-27 |
WO2009115722A1 (en) | 2009-09-24 |
ES2654921T3 (en) | 2018-02-15 |
US9023126B2 (en) | 2015-05-05 |
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